Valve lapping fixture



Dec. 2, 1952 w. F. KLATT 2,619,778

VALVE LAPPING FIXTURE Filed Jan. 16, 1951 IEIIEE INVENTOR. WARREN F. KLATT Patented Dec. 2, 1 952 UNITED STATES PATENT OFFICE VALVE LAPPING FIXTURE I I Warren F. Klatt, Los Angeles, Calif. Application January 16, 1951, Serial No. 206,206

1 Claim.

ments, and more particularly to a magnetic valve holder adapted to be employed in grinding or lapping valves on their seats. v i r A main object of the invention is to provide a novel and improved lapping fixture for the valves of internal combustion engines, said fixture being very simple in construction, being easy to use, and which may be employed either for manual rotation of the valves or in conjunction with a rotary driving motor.

A further object of the invention is to provide an improved valve-lapping fixture which involves inexpensive parts, which provide efiicient transmission of torque to the valves for the grinding thereof, which may be employed with ground valves or with valves having fiat heads, which is effective regardless of the condition of the top surface of the valve, and which provides a great saving in time in the process of lapping or grinding valves on their seats.

Further objects and advantages of the invention will become apparent from the following description and claim, and from the accompanying drawings, wherein:

Figure 1 is a vertical, cross-sectional view taken through a fragmentary portion of the top of an internal combustion engine, showing an improved valve-lapping fixture according to the present invention engaged with a valve to be lapped or ground on its seat;

Figure 2 is an enlarged, cross-sectional view taken on line 2--2 of Figure 1;

Figure 3 is a perspective view showing the portions of the improved valve fixture of Figures 1 and 2 in separated positions, together with a handle member which may be employed for manually grinding or lapping a valve.

Referring to the drawings, H generally designates the top portion of an automobile internal combustion engine, or other internal combustion engine, and I2 designates a valve seat which is in cooperative relationship with a valve head [3. As will be understood by those skilled in the art, in order to provide sealing contact of the valve head l3 with the seat I2, it is necessary to lap the valve head l3 on the seat I2 by rotating the valve head. Designated generally at I4 is an improved fixture or tool which is employed to hold the valve head and to transmit torque thereto for rotating said valve head on the seat l2 during the lapping operation.

The fixture l4 comprises a main cylindrical body l5 of permanently magnetized material formed at its top with the axial, upstanding stud element It. Designated at I1 is a sleeve member of resilient, deformable material, such as rubber, which is fri-ctionally engaged on the stud [6. The sleeve member I! may be employed to connect' the stud 16 to the shaft of a rotary driving tool, such as to the shank of an electric motor, or alternatively, a handle member, such as shown at l8 in Figure 3, may be frictionally secured in, the sleeve IT for manually rotating the body For example, the handle is may be positioned between the palms of the hands of the operator and the handle l8 may be rotated by moving the hands backward and forward relative to each other. Handle l8 may be made of wood or any other suitable material. Secured to the plane bottom of the body l5 in any suitable manner is a neoprene washer l9, said washer being secured by the use of suitable cement. As shown in Figure 2, the washer l9 lies in a plane parallel to the bottom end surface of the body, and defines a circular space at the bottom of the body I5 adapted to receive the crown portion of a valve is, whereby the valve head may project into the plane of the washer and be held by magnetic attraction. The neoprene washer l9 provides substantial friction at its area of contact with the valve head l3, whereby torque may be transmitted from the body l5 to the valve head.

In using the device, the fixture is engaged on the valve head in the manner shown in Figures 1 and 2, and the body I5 is rotated, either by the use of the manual tool l3 or by connecting the sleeve ll to the driving shaft of a suitable rotary tool, such as an electric motor. Torque is transmitted to the valve head [3, whereby the valve head is rotated on the seat l2 to provide the desired lapping or grinding motion. It will be noted that the head i3 is securely held by the body 15, regardless of the condition of the head, namely, regardless of the presence of pits or other irregularities in the top surface of the head l3. It will be readily understood that the magnetic body IE will hold any valve head made of steel or other highly permeable material. Furthermore, it will be understood that the valve head l3 may have a flat top surface instead of the crowned surface shown, without substantially reducing the effectiveness of the fixture.

While a specific embodiment of an improved valve-lapping fixture has been disclosed in the foregoing description, it will be understood that various modifications within the spirit of the invention may occur to those skilled in the art. Therefore, it is intended that no limitations be placed on the invention except as defined by the scope of the appended claim.

What is claimed is:

A valve lapping fixture comprising a perma nent magnet formed as a cylindrical, wholly solid block of constant diameter from end to end thereof and having its length substantially equal to said diameter, one end surface of the block having an integral, axial stud reduced in diameter relative to the main diameter of the block; means to secure the magnet to a rotatable member for rotation therewith including an elongated sleeve member of resilient, deformable material having an end to end axial bore opening at oppositeends of said sleeve member, said stud extending into and being frictionally engaged in-"one end of-the bore and the other end of the bore beinggadapted to receive said rotatable member, the other end of the block having a plane, uninterrupted surface throughout its area; and an annular washer --ofzcqmpressibla:resilientanaterialifixedlysecured tq-saidmlanesurface, saidwasher?being-substan- 'tially=z qu e. :in; :cr0ss:.seetionr to permi c mpr si n -;the1;eof :alonglines, extending1both-.:radially 1, :ofian'd impara-llelism withithe; axisrofz rotation of tilhezh ock; rand havingan externaldiameter equal 4 to said main diameter of the block and an inner diameter only slightly smaller than said main diameter of the block to form a shallow depression at said other end of the block bottomed by said plane, uninterrupted magnetic surface and rimmed by said radially and axially compressible washer.

WARREN F. KLATT.

,file of this patent:

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